<template>
  <div class="row" :style="rowStyle" :class="rowClass">
    <slot></slot>
  </div>
</template>
<script>
export default {
  name: 'GuluRow',
  props: {
    gutter: {
      type: [Number, String]
    },
    align: {//排列对齐验证
      type: String,
      validator(value) {
        return ['left', 'right', 'center'].indexOf(value) >= 0;
      }
    }

  },
  computed: {
    rowStyle() {
      let {gutter} = this
      return {marginLeft: -gutter / 2 + 'px', marginRight: -gutter / 2 + 'px'}
    },
    rowClass() {
      let {align} = this
      return [align && `align-${align}`]
    }
  },

  mounted() {
    this.$children.forEach((vm) => {
      vm.gutter = this.gutter
    })
  }
}
</script>
<style lang="scss" scoped>
.row {
  display: flex;
  flex-wrap: wrap;
  &.align-left {justify-content: flex-start;}
  &.align-right {justify-content: flex-end;}
  &.align-center {justify-content: center;}
}

</style>